police are looking for a woman they say is heavyset, in her 20s. she was caught by security cameras running away after the attack. >>> despite the death, violent crime in new york city is actually down. the murder rate is on pace to be the lowest in 18 years. as of friday, the city has had 414 killings. in 2009, new york recorded the fewest, 471. that's why mayor michael bloomberg calls new york the safest big city in america. it wasn't always that way. in 1990, new york racked up more than 2,200 homicides. >>> the sandy hook school shooting has had an immediate affect on one city. police in bridgeport, connecticut, are determined to get guns off the streets by buying them back using $100,000 in donations from the public. here's david arioso. >> reporter: william porter says he is done with guns. the elementary school shooting in nearby newtown, connecticut, struck a nerve. >> my wife cried. we was out shopping and heard it while we was in the store. she cried. you know, it's wrong. >> how are you, sir? >> reporter: porter is turning over his handg